Troubleshooting Schedule - Husqvarna P 520D Operator's Manual

Problem
Engine does not start
Starter motor does not turn over the engine
Engine does not run smoothly
Abnormal exhaust smoke
Black smoke
Blue smoke
White smoke
Engine seems to have no power
Engine overheats

Troubleshooting schedule

Cause
There is no fuel in the fuel tank
Air in fuel system
Incorrect fuel type
Ignition system inoperative
Serious engine damage
Battery flat
Poor contact affecting the battery terminal cable connections, ignition lock, or
starter
Power take off (PTO) activated
Air in fuel system
Fuse on or near the battery blown (check 2 off)
Start lock broken
Faulty starter motor
The parking brake is not on
Faulty or improperly adjusted parking brake switch
Faulty relief valve
Clogged fuel filter
Air filter clogged
Fuel tank vent blocked
Low feed pressure
Loose fuel pressure line (injector pipe)
Faulty fuel injector
Faulty injection pump
Faulty feed pump
Incorrect fuel type
Serious engine damage
Incorrect amount of fuel from injection pump
Faulty fuel injector
Incorrect timing of fuel injection pump
Air filter clogged
Engine oil level too high
Serious engine damage
Cylinder head gasket damaged
Cylinder head cracked
Engine oil level too high
Air filter clogged
Air in fuel system
Clogged fuel filter
Faulty relief valve
Low feed pressure
Faulty feed pump
Incorrect timing of fuel injection pump
Serious engine damage
Engine overloaded
Coolant level too low
Air intake or cooling flanges blocked
Fan damaged
Too little or no oil in engine
Incorrect radiator cap
Coolant pump drive belt broken
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